Umbrella



FIG. 1 is a perspective view of the umbrella of this invention;

FIG. 2 is a front elevational view thereof; the rear elevational view,the left side elevational view and the right side elevational view beinga mirror image thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The ornamental design for an umbrella, as shown.